WordPress for i-phone – part deaux

Thank you to all of you kind souls who are sending me all sorts of helpful links:

Q: I get an “XML-RPC Service for you blog cannot be found” error but I have XML-RPC enabled, what do I do ?
A: First ensure that you’ve typed in the URL correctly. If it’s correct, and you are on self-hosted WordPress, verify that xmlrpc.php is functioning properly. Locate your RSD meta tag by viewing-source on your blog. It will look similar to this:
<link rel=”EditURI” type=”application/rsd+xml” title=”RSD” href=”http://example.com/xmlrpc.php?rsd” />
Next follow the link, http://example.com/xmlrpc.php?rsd, and make sure it resolved to an XML file. Locate the WordPress api item:http://example.com/xmlrpc.php
And lastly, load that apiLink value into your browser. If everything is setup correctly, you should see this message: “XML-RPC server accepts POST requests only.”

Q: I followed the XML-RPC verification steps above, but I get a different message, now what ?
A: Check with your hosting provider or sys admin to see if permissions or other issues are causing the error. If you receive a “Precondition Failed” that is most likely a mod_Security issue discussed here: http://wordpress.org/support/topic/130095

Q: I checked the RSD and XML-RPC and everything is fine but I still get error and/or can’t add my blog, now what ?
A: Another common issue that can cause errors with the App is invalid characters. The easiest way to check is to go here: http://validator.w3.org and type in the URL of your WordPress site. If you get a response such as “… one or more bytes that I cannot interpret as utf-8″ that is most likely what is causing the iPhone App to have trouble with your site

None of these are true but my goodness me, I did the validator thing – look at this scary thing.

I have the same error. I don’t understand why …
I receive this error by validation tool:

Sorry, I am unable to validate this document because on line 504 it contained one or more bytes that I cannot interpret as utf-8 (in other words, the bytes found are not valid values in the specified Character Encoding). Please check both the content of the file and the character encoding indication.
The error was: utf8 “\xC2″ does not map to Unicode